h1 {
  counter-reset: h2;
}

h2 {
  counter-reset: h3;
}

h3 {
  counter-reset: h4;
}

h4 {
  counter-reset: h5;
}

h5 {
  counter-reset: h6;
}

h2::before {
  counter-increment: h2;
  content: counter(h2);
  margin-right: 0.8rem;
}

h3::before {
  counter-increment: h3;
  content: counter(h2) "." counter(h3);
  margin-right: 0.8rem;
}

h4::before {
  counter-increment: h4;
  content: counter(h2) "." counter(h3) "." counter(h4);
  margin-right: 0.8rem;
}

h5::before {
  counter-increment: h5;
  content: counter(h2) "." counter(h3) "." counter(h4) "." counter(h5);
  margin-right: 0.8rem;
}

h6::before {
  counter-increment: h6;
  content: counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) "." counter(h6);
  margin-right: 0.8rem;
}
